保存NSMutableArrays pList

Question

我想存儲一個NSMutableArray到一個pList，但是當我檢查我的data.plist，裏面沒有任何值。任何想法爲什麼？

-(void)run 
{ 
Global *myGlobal = [Global sharedGlobal]; 

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString *documentsDirectory = [paths objectAtIndex:0]; 
NSString *path = [documentsDirectory stringByAppendingPathComponent:@"data.plist"]; 

NSMutableDictionary *category = [[NSMutableDictionary alloc]init]; 
NSMutableDictionary *totalCategory = [[NSMutableDictionary alloc]init]; 
for (int i = 0 ; i < [myGlobal.categoryArray count];i++){ 
    Category * c = [categoryArray objectAtIndex:i]; 

    [category setObject:c.name forKey:@"category"]; 

    [totalCategory setObject:category forKey:@"allCategory"]; 

    NSMutableDictionary *stock = [NSMutableDictionary dictionaryWithContentsOfFile:path]; 
    [stock writeToFile:path atomically:YES]; 
} 
if(totalCategory==nil){ 
    NSLog(@"failed to retrieve dictionary from disk"); 
} 
} 

Answer 1

這兩行沒有意義。第一行將path中的字典讀入stock，第二行將其寫回。沒有任何內容添加到stock。

NSMutableDictionary *stock = [NSMutableDictionary dictionaryWithContentsOfFile:path]; 
[stock writeToFile:path atomically:YES]; 

Answer 2

當保存到pList時，應該試着使它像這樣。

 
[totalCategory writeToFile:path atomically:YES]; 

這是，如果我不包括行[將writeToFile]那麼它不會我的字典/陣列存儲到plist中它是如何工作正常

 

+ (void) saveParams:(int)kotuc one:(NSNumber*)one two:(NSNumber*)two three:(NSNumber*)three four:(NSNumber*)four five:(NSNumber*)five six:(NSNumber*)six seven:(NSNumber*)seven eight:(NSArray*)eight{ 

    NSString *path = [self getNSPath]; 
    NSDictionary* dw = [[NSDictionary alloc] initWithContentsOfFile:path]; 
    NSMutableDictionary* dict = [[NSMutableDictionary alloc] init]; 

    NSArray *keys = [[NSArray arrayWithObjects:@"one", @"two", @"three", @"four", @"five", @"six",@"seven", @"eight",nil] retain]; 
    NSArray *objects = [[NSArray arrayWithObjects:one, two, three, four, five, six, seven, eight, nil] retain]; 


    NSMutableDictionary *subDict = [[NSMutableDictionary alloc] initWithObjects:(NSArray *)objects forKeys:(NSArray *)keys]; 


    ////save old 
    [dict setDictionary:dw]; 
    ////save new 
    [dict setObject:subDict forKey:[NSString stringWithFormat:@"%i", kotuc]]; // 
    //write to file 
    [dict writeToFile:path atomically:YES]; 


    [dw release]; 
    [dict release]; 
    [subDict release]; 
    [keys release]; 
    [objects release]; 
}